board: post-merge hygiene for #1177

[AdaWorldAPI]

The merged-PR obligations from CLAUDE.md's board-hygiene table: a PR_ARC_INVENTORY PREPEND and a LATEST_STATE row for #1177 (eb84b275).

#1177 was not hygiene-only — it added a plan, five D-ids and four board corrections — so the termination clause does not discharge it and both entries are owed.

What the entries record beyond the summary

• BackingStoreWrite is BUILT and UNWIRED. 9 methods, both arms real, zero callers outside its own test module, behind a feature no workflow builds. The board had the migration as design-stage.
• dispatch_busdto:281 is excluded from the cutover, not routed — it needs an f32 tenant MailboxSoA does not have. Found by codex, not by me.
• Three board facts corrected: COMPONENT-MAP.md:108's retirement wave "(W7)" does not exist; the parity gate is :1361, not :1145; there are two parity tests, not one.
• The stranded predecessor is logged as an OPEN operator decision, not silently closed — council-hardened, 2770 commits divergent, never on main.
• The review arc's own lesson: twice in two commits a fix landed in the plan and was not propagated to the board, and the two then disagreed. A grep cannot catch it — the plan matches, and the board's silence reads as absence of an opinion rather than contradiction. A per-deliverable plan↔board diff can.

Termination

This PR's entire content is board hygiene for a prior PR, so per CLAUDE.md's termination clause it generates none of the merged-PR obligations — no arc entry, no LATEST_STATE row. The chain stops here by rule, not by omission.

Verification

Read-before-write on both ledgers, with the wc -l post-check the destructive-prepend law requires: PR_ARC 6279 → 6290, LATEST_STATE 3033 → 3047 — neither shrank. Index regenerated last, after the board writes, per the #1085 ordering — already current. append-only OK (9 checked), no new citation decay, zero files under crates/.

🤖 Generated with Claude Code

https://claude.ai/code/session_01AGVLyRZNEKKBSfBDJfbY3V

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